There's no "favorite". Is only useful when is need it.
I would mention here some:
[LNbits for WooCommerce](https://wordpress.org/plugins/lightning-payment-gateway-lnbits/) - Use LNbits as a payment method
[Pay-to-read-more](https://github.com/schulterklopfer/ptrm) - Wordpress plugin for paywalled content
[WP-Lightning](https://github.com/bumi/wp-lightning) - A Bitcoin Lightning paywall plugin for Wordpress.
[Pay to Comment with Lightning](https://github.com/bumi/wp-lightning) - This plugin disables the comment form until a Lightning payment is received
[BTCPay for woocommerce legacy](https://wordpress.org/plugins/btcpay-for-woocommerce/)
[BTCPay for woocommerce V2](https://wordpress.org/plugins/btcpay-for-woocommerce/)
[NoMiddleMan BTC onchain plugin](https://wordpress.org/support/plugin/nomiddleman-crypto-payments-for-woocommerce/)
[Wordpress Lightning publisher](https://github.com/ElementsProject/wordpress-lightning-publisher)
[LN login for wordpress](https://gofile.io/d/MaHOSH)
and are many more...